‏الحج : Hadeeth No:2896 Nafi' reported on the authority of Ibn Umar (Allaah be pleased with them) that Allaws Messenger (sallAllaahu alayhi wa sallam) walked swiftly from stone to stone in three circuits and walked (normally) in four....

‏النكاح : Hadeeth No:3374 Abu Sa'id al-Khudri (Allaah be pleased with him) (was asked if he had heard it himself), to which he said: Yes. (I heard) Allaah's Prophet (sallAllaahu alayhi wa sallam) as saying: There is no harm if you do not practise it, for it (the birth of the child) is something ordained (by Allaah)....